.. efun:: int member(mixed *array, mixed elem [, int start])
  int member(string s, int elem [, int start])
  int member(mapping m, mixed key)

  For arrays and strings, returns the index of the first occurance of second arg in the first arg, or -1 if none found. If :arg:`start` is given and non-negative, the search starts at that position. A start position beyond the end of the string or array will cause the efun to return -1.

  For mappings it checks, if key is present in mapping m and returns 1 if so, 0 if key is not in m.

  :history 3.3.556 changed: added the :arg:`start` parameter.

  .. seealso:: :efun:`rmember`, :type:`mapping`